<\/div>\n
Merhaba,<\/p>\n
Bu i\u00e7eri\u011fimizde Express.js’de genel hata y\u00f6netimi \u00fczerine konu\u015fuyor olaca\u011f\u0131z.<\/p>\n
Express.js’de genel hata y\u00f6netimini sa\u011flayabilmek i\u00e7in hata y\u00f6netimi i\u00e7in \u00f6zel dizayn edilmi\u015f middleware<\/a> kullanmam\u0131z gerekmektedir.<\/p>\n
\u00d6rnek olarak a\u015fa\u011f\u0131daki kod blo\u011funu inceleyiniz.<\/p>\n
\r\nconst express = require("express");\r\nconst app = express();\r\nconst routes = require(".\/routes");\r\nconst middleware = require(".\/middleware")\r\n\r\napp.use("\/", middleware);\r\napp.set("view engine", "pug");\r\napp.use("\/", routes);\r\n\/\/------ Error MiddleWare\r\napp.use("\/", (error, request, response, next) => {\r\n    response.status(error.status);\r\n    response.render("error", { status: error.status, message: error.message });\r\n});\r\n\/\/------ Error MiddleWare\r\napp.use(express.static("node_modules"));\r\napp.listen(5000);\r\n<\/pre>\nYukar\u0131daki kod blo\u011funa bakarsan\u0131z e\u011fer hata ara katman\u0131n\u0131n tan\u0131mland\u0131\u011f\u0131n\u0131 g\u00f6receksiniz. Bu tan\u0131mlanan callback fonksiyonu, tan\u0131mland\u0131\u011f\u0131 “use” fonksiyonunun birinci parametresindeki “\/” de\u011ferden dolay\u0131 t\u00fcm routelara uygun \u00e7al\u0131\u015facakt\u0131r. Ayr\u0131ca bu callback fonksiyon, al\u0131nan hatayla ilgili bilgi al\u0131nabilmesi i\u00e7in “error” parametresi bar\u0131nd\u0131rmaktad\u0131r.<\/p>\n\r\n.\r\n.\r\n.\r\nrouter.get("\/", (request, response, next) => {\r\n    if (false)\r\n        response.render("index", { title: "Anasayfa" });\r\n    else\r\n        next({ status: 404, message: "Beklenmeyen bir hatayla kar\u015f\u0131la\u015f\u0131ld\u0131." });\r\n})\r\n.\r\n.\r\n.\r\n<\/pre>\nTan\u0131mlanm\u0131\u015f routelar aras\u0131ndan herhangi birinde yukar\u0131daki kontrol\u00fc sa\u011flarsak e\u011fer ilgili “next” fonksiyonu tetiklendi\u011fi zaman bizim biraz \u00f6nce tan\u0131mlam\u0131\u015f oldu\u011fumuz error middleware’\u0131m\u0131z tetiklenecektir ve parametre olarak verdi\u011fimiz de\u011fi\u015fkenler ilgili hata katman\u0131ndaki “error” parametresi taraf\u0131ndan yakalanacak ve hata bilgisini ta\u015f\u0131yacakt\u0131r. Burada dikkat etmeniz gereken husus, hata kontrol\u00fcn\u00fc sa\u011flayaca\u011f\u0131m\u0131z route yap\u0131lar\u0131na bildi\u011fimiz “request” ve “response” parametrelerinin yan\u0131nda bir de “next” parametresi eklenmi\u015f bulunmaktad\u0131r.<\/p>\n
Olas\u0131 bir hata yakaland\u0131\u011f\u0131 esnada render edilecek “error.pug” dosyam\u0131z\u0131da a\u015fa\u011f\u0131daki gibi dizayn edersek e\u011fer;<\/p>\n\r\n    div(class="alert alert-primary", role="alert")\r\n        h2(style="color:red;")  Hata \r\n            h3 Status : #{status}\r\n            h4 Message : #{message}\r\n<\/pre>\n<\/a>
\n\u015feklinde olas\u0131 hatalar\u0131m\u0131z\u0131 kar\u015f\u0131la\u015fmaktay\u0131z.<\/p>\n
Sonraki yaz\u0131lar\u0131mda g\u00f6r\u00fc\u015fmek \u00fczere…
\n\u0130yi \u00e7al\u0131\u015fmalar…<\/p>\n","protected":false},"excerpt":{"rendered":"
Merhaba, Bu i\u00e7eri\u011fimizde Express.js’de genel hata y\u00f6netimi \u00fczerine konu\u015fuyor olaca\u011f\u0131z. Express.js’de genel hata y\u00f6netimini sa\u011flayabilmek i\u00e7in hata y\u00f6netimi i\u00e7in \u00f6zel dizayn edilmi\u015f middleware kullanmam\u0131z gerekmektedir. \u00d6rnek olarak a\u015fa\u011f\u0131daki kod blo\u011funu inceleyiniz. const express =...<\/p>\n","protected":false},"author":1,"featured_media":8686,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2495,2145],"tags":[2497,2528,1833,2147,2529],"class_list":["post-8883","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-express-js","category-node-js","tag-express-js","tag-express-js-hata-yonetimi","tag-hata-yonetimi","tag-node-js","tag-node-js-hata-yonetimi"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts\/8883","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/comments?post=8883"}],"version-history":[{"count":3,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts\/8883\/revisions"}],"predecessor-version":[{"id":8887,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts\/8883\/revisions\/8887"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/media\/8686"}],"wp:attachment":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/media?parent=8883"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/categories?post=8883"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/tags?post=8883"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}